Crank chamber



April 8, 1924. 1,489,832

F. E. KARTHAUS ET AL CRANK CHAMBER Patented Apr. 8, Eg s FRANS EliEILE KARTHAUS AND CGRNELIS JOSEPH EUOGVELD, F DELFT, NETHER- ear-Ins.

CRANK CHAMBER.

7 Application filed July 29, 1921.

2' '0 all whom it may concern:

Be it known that we, FRANS EMILE Kan- THAUS and Connnnrs JOSEPH Hooevsnn, subjects of the Queen of the Netherlands, residing at Delft, Simonstraat 105, Netherlands, have invented certain new and useful improvements in Crank Chambers, of which the following is a specification.

This invention relates to a device for dividing or closing a crankchaniber, more especially if this dividing or closing has to be carried out at the place where an excentric part of the crankshaft is situated.

The invention presents special advantages if applied for the purpose of separating parts of the crankchamber of a two-strokecycle internal combustion engine, said parts belonging to difierent cylinders of a multiple cylinder engine of the style where the crankohamber serves the purpose of a scavenging pump.

These engines presented the defect that, in case the respective pistons of the respective cylinders did not occupy the same position, the crankchamber would be divided in as many pumping chambers, separated from each other, such being the case if the cylin ders were placed in a radial row about the crankshaft.

Up to now, fixed partitions have been inserted, involving the necessity of providing the crankshaft with as many two-throw cranks as there are pumping chambers.

ihis construction of the engine, not only causes complication and high cost but also an increase in dead weight and at the same time also a considerable increase in size in the crankshaft. This invention avoids these difiiculties because it allows of having a closing or dividing wall at the place of an encentric part of the crankshaft. According to the invention this has been realized by means of one or more discs, concentric with the shaft and running in a corresponding groove in the inner wall of the crankchainber, said discs being provided with an opening for the passage of the eircentric part of the crankshaft.

In order to have a tight joint between these discs and the'crankchamber they may be made so thin that the difference in pressure at each side will cause them to have their circumferential part lie tight against a side of the groove in the crankchamber. This is of special importance if the disc,

Serial R 0. 488,870.

at the place where the crankshaft passes through, is fixed to this latter.

In case of an engine construction that has been rendered a practical possibility in consequence of the invention, viz, that whereby the connecting rods'of two pistons of two opposite cylinders engage one and the same crankpin, the disc has been keyed to the crankpin with the aid of two flanged sleeves, these latter as well serving the purpose of procuring running guides for the connecting rod heads.

In the accompanying drawing the invention has been further explained by means of a section of a two cylinder engine, with the cylinders in opposition.

Thecylinders 1 and 2 are mounted upon the two-part crankchamber 3 in the usual manner with the aid of flanges. The crankshaft is built up of two shaft ends 4 and 5, each provided with a flywheel, indicated as 6 and 7 and connected by one and the same crankpin 8.

One end of this crankpin and both of the shaft ends 4 and are joined to said flywheels by means of a conical end and a key while the other end of said crankpin fits with a cylindrical end into one of the flywheels. Both of the pistons 9 and 10 are connected to the crankpin by means of connecting rods 11 and 12.

Between the connecting rods, a disc 13 is mounted, serving as a partition and having an opening for the passage of the crankpin. The circumferential part of said disc runs in a groove, formed by recesses in two rings 14: and 15, these rings serving the purpose of centering both parts of the crankchamber.

The disc 13 is mounted rigidly on the crankpin by means of two flanged sleeves 16 and 1? riveted to the disc and keyed to the crankpin withthe same key 18 as is used to key the flywheels 7 and 8 thereto. These flanged sleeves procure a runningguide for the heads of the connecting rods 11 and 12.

It may be remarked that the invention also gives a favourable distribution of tangential pressure upon the crank, because, e. g., the construction as given in the drawing, allows of a live stroke at each half turn.

Any kind of engine may be fitted with a device for dividing the crankchamber into separate parts in the manner disclosed by the invention, if such be desired. 7

Furthermore it is possible to replace one or both of the side Walls of the crankchamber of some engine, by a disc, according to the invention, so that a rotating crankpin extends from the crankchamher.

Having noW described our invention, What- We claim as new and desire to secure by Letters Patent is l. Mieans for the purpose described, comprising a crank chamber, a crankshaft there in having an eccentric portion, a thin flexible disc separating the chamber into two portions, said disc being keyed to said cccentric' portion by means of two opposing flanged sleeves, the sleeves affording guide surfaces for heads of connecting rod.

2. Means ior the purpose described, coinnising a crank chamber, a crankshaft therein, a disc Within the chamber and connected to the crankshaft by means of two flanged sleeves riveted to the disc, said sleeves being keyed to the crankshaft. 4

3. A device according to claim 1, stud disc having an eccentric aperture, said eccentric portion of the crank shaft being received in the eccentric aperture.

A derice according to claim 2, said disc raving an eccentric aperture, said crank shaft having an eccentric portion received in said aperture, headed connecting rods entering the chamber, said flanged sleeves affording guide surfaces for the heads of th connecting rods.

5. Means according to claim 1, said disk being connectee to the crank shaft at but one point.

Means according to claim 1, said disk being connected to the crank shaft intermediate the ends of the said eccentric portion or the; crank shaft.

in testimony whereof We affix our signatures.

:16 OGVELD. KARTHAUS. 

